Manchester united+Chelsea
That is debatable. Michigan has had the most fans in a stadium in a game, and there are fans growing everyday.
Panathinaikos
Poland and Scotland.
cristiano ronaldo (football player) real madrid (football club)
Celtic Fc has the most fans followed by Rangers FC! mon the hoops:D
Manchester united
That would be American Football.
LIVERPOOL
Most likely the pittsburgh steelers
Ultras are the hardcore football (soccer) fans/supporters who are known for their chanting and creating atmosphere. Ultras can be violent at times and cause trouble. Most travel wherever the team goes.
The best football fans in the world is England Football fans.